Have just had one delivered today and same problem. (Win8.1). The only paper instructions showed pictures of activating the batteries, plugin the transmitter and off we go. No mention of installing drivers before inserting transmitter.
As noted earlier, the Desktop & Mouse Center do not appear to support this model. http://www.microsoft.com/hardware/en-us/help/windows-8/troubleshooting/mouse/supported-devices
I also have an Arc mouse which is the only device showing.
Is this likely to be fixed, or have I bought a dud?